Fix reading xattrs in object-server's unittests.

Use for reading metadata in unit tests function from object-server.

Change-Id: I2bfeb76fdd775442a0e614fef740b0987fba4a22
Fixes: bug #1079131
SLO multipart-manifest=get returns incorrect Content-Type

Change-Id: I657c9f7a7555d90ccfa7e6ff0f5f3fcbd7eada1d
Change setup.cfg style.

Change-Id: I466470237ddd317740eb99bd55af7e7a50270ae3
Fixes: bug #1163258
Merge "Change setup.cfg style."
Merge "SLO multipart-manifest=get returns incorrect Content-Type"
Merge "Fix reading xattrs in object-server's unittests."